<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="./vue.global.js"></script>
  <title>Document</title>
</head>
<body>
  <div id="root">
    {{title}}
  </div>
  <script>
    const { createApp } = window.Vue
    const app = createApp({
      data() {
        return {
          title: 'hello'
        }
      },

      unmounted() {
        console.log('unmounted.')
      },
    })
    let vm = app.mount('#root')
    app.unmount()
    vm.title = 'world'
  </script>
</body>
</html>